<template>
	<view>
    <!-- 使用自定义的搜索组件 -->
    <!-- <my-search :bgcolor="'pink'" :radius="40"></my-search> -->
     <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题 -->
        <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
        <!-- 当前二级分类下的三级分类列表 -->  
        <view class="cate-lv3-list">
          <!-- 三级分类的item项 -->
          <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
            <!-- 三级分类的图片 -->
            <image :src="item3.cat_icon" ></image>
            <!-- 三级的文本 -->
            <text>{{item3.cat_name}}</text>
          </view>
        </view>
        </view>
      </scroll-view>
    </view>
	</view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
    mixins: [badgeMix],
		data() {
			return {
        //当前设备可用的高度
				wh: 0,
        cateList: [],
        active: 0,
        //二级分类列表
        cateLevel2: [],
        scrollTop: 0
			};
		},
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      console.log(sysInfo);
      this.wh = sysInfo.windowHeight - 50
      
      this.getCateList()
    },
    methods: {
      //获取分类列表的数据
      async getCateList() {
        const {data: res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        //重新为滚动条赋值，前后赋值不能一样 让其在0和1之间转换
        this.scrollTop = this.scrollTop ===0 ? 1 : 0
      },
      //跳转到商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
	}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
}
.left-scroll-view {
  width: 120px;
}
.left-scroll-view-item {
  background-color: #F7F7F7;
  line-height: 60px;
  text-align: center;
  font-size: 13px;
  
  &.active{
    background-color: #ffffff;
    position: relative;
    
    &::before {
      content: '';
      display: block;
      width: 3px;
      height: 30px;
      background-color: #c00000;
      position: absolute;
      top: 50%;
      left: 0;
      transform: translateY(-50%);
    }
  }
  }
  
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 20px;
}

.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item {
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    image {
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px;
    }
  }
}
</style>
